<template>
  <view class="viewport">
    <!-- 推荐封面 -->
    <view class="cover">
      <image :src="bannerPicture"></image>
    </view>
    <!-- tab栏 -->
    <view class="tabs">
      <text
        class="text"
        v-for="(item, index) in recommendList"
        :key="index"
        :class="{ active: index === activeIndex }"
        @tap="changeTabs(index)"
      >
        {{ item.subTypes.title }}
      </text>
    </view>
    <!-- 列表内容 -->
    <scroll-view
      scroll-y
      class="scroll-view"
      @scrolltolower="handleScrolltolower"
      v-for="(item, index) in recommendList"
      :key="index"
      v-show="activeIndex === index"
    >
      <view class="goods">
        <navigator
          hover-class="none"
          class="navigator"
          v-for="goods in item.goodsItems.items"
          :key="goods.id"
          :url="`/pages/goods/index?id=${goods.id}`"
        >
          <image class="thumb" :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
          </view>
        </navigator>
      </view>
      <view class="loading">正在加载...</view>
    </scroll-view>
  </view>
</template>

<script>
import { getHomeRecommend } from "@/http/home";
export default {
  data() {
    return {
      // 背景大图
      bannerPicture: "",
      // 当前显示的tab栏
      activeIndex: 0,
      // 列表数据
      recommendList: [],
    };
  },
  methods: {
    changeTabs(index) {
      this.activeIndex = index;
    },
    // 触底函数
    async handleScrolltolower() {
      // 判断当前发送请求的哪组数据
      const currentShow = this.recommendList[this.activeIndex];
      const { page, pages } = currentShow.goodsItems;
      if (page >= pages) {
        uni.showToast({ title: "没有更多数据了", icon: "none" });
        return;
      } else {
        // 请求参数
        const data = {
          subType: currentShow.subTypes.id,
          page: page + 1,
          pageSize: 10,
        };
        // 重新发送请求
        const result = await getHomeRecommend(this.currentInfo.url, data);
        // 返回的新数据
        const newGoodsItems = result.result.goodsItems[currentShow.subTypes.id];
        // 新数据覆盖旧数据以及items数组的合并
        this.recommendList[this.activeIndex].goodsItems = {
          ...newGoodsItems,
          items: [
            ...this.recommendList[this.activeIndex].goodsItems.items,
            ...newGoodsItems.items,
          ],
        };
      }
    },
  },
  async onLoad({ type }) {
    const urlMap = {
      1: { title: "特惠推荐", url: "/home/preference/mutli" },
      2: { title: "爆款推荐", url: "/home/inVogue/mutli" },
      3: { title: "一站买全", url: "/home/oneStop/mutli" },
      4: { title: "领券中心", url: "/home/new/mutli" }, // 后端未提供，暂用新鲜好物url
      5: { title: "新鲜好物", url: "/home/new/mutli" },
    };
    // 获取当前type对应的数据
    this.currentInfo = urlMap[type];
    // 动态设置页面的标题
    uni.setNavigationBarTitle({ title: this.currentInfo.title });
    // 发送请求获取对应数据
    const result = await getHomeRecommend(this.currentInfo.url);
    // 设置背景大图
    this.bannerPicture = result.result.bannerPicture;
    // tab栏数据
    // 构造数据列表
    this.recommendList = result.result.subTypes.map((v) => {
      // 获取 subTypes id对应的数据
      const id = v.id;
      // id 就是 goodsItem的key，根据key获取对应的值
      const value = result.result.goodsItems[id];

      return {
        // tab栏要的数据 构造好
        subTypes: v,
        // 商品列表相关的数据
        goodsItems: value,
      };
    });
    console.log(this.recommendList);
  },
};
</script>

<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}
.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}
.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
}
.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;
  .text {
    margin: 0 20rpx;
    position: relative;
  }
  .active {
    &::after {
      content: "";
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}
.scroll-view {
  flex: 1;
  overflow: hidden;
}
.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;
  .navigator {
    width: 345rpx;
    padding: 20rpx;
    margin-top: 20rpx;
    border-radius: 10rpx;
    background-color: #fff;
  }
  .thumb {
    width: 305rpx;
    height: 305rpx;
  }
  .name {
    height: 88rpx;
    font-size: 26rpx;
  }
  .price {
    line-height: 1;
    color: #cf4444;
    font-size: 30rpx;
  }
}
.goods .symbol,
.goods .decimal {
  font-size: 70%;
}
</style>